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Goodwill and intangibles - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 02, 2020
Aug. 03, 2019
May 04, 2019
Feb. 02, 2019
May 05, 2018
Jan. 30, 2021
Feb. 01, 2020
Feb. 02, 2019
Finite-Lived Intangible Assets [Line Items]                
Goodwill, impairment loss           $ 10.7 $ 47.7 $ 521.2
Indefinite-lived intangible asset impairment           83.3 0.0 214.2
Amortization of intangible assets           0.9 0.9 4.0
Amortization of intangible liabilities           5.4 5.5 7.9
North America                
Finite-Lived Intangible Assets [Line Items]                
Goodwill, impairment loss $ 10.7 $ 47.7       $ 10.7 $ 47.7 308.8
Impairment of intangible assets (excluding goodwill)       $ 74.3        
North America | R2Net Inc.                
Finite-Lived Intangible Assets [Line Items]                
Goodwill, impairment loss   12.5           208.8
Goodwill and intangible asset impairment     $ 69.3          
North America | Zales                
Finite-Lived Intangible Assets [Line Items]                
Goodwill, impairment loss   $ 35.2            
Impairment of intangible assets (excluding goodwill)         $ 139.9      
Indefinite-lived intangible asset impairment $ 83.3              
Other | R2Net Inc.                
Finite-Lived Intangible Assets [Line Items]                
Goodwill, impairment loss               $ 3.6